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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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275 lines
7.8 KiB
C
275 lines
7.8 KiB
C
/* GStreamer
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* Copyright (C) <2008> Thijs Vermeir <thijsvermeir@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <string.h>
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#include "gstsrtenc.h"
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GST_DEBUG_CATEGORY_STATIC (srtenc_debug);
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#define GST_CAT_DEFAULT srtenc_debug
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enum
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{
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PROP_0,
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PROP_TIMESTAMP,
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PROP_DURATION
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};
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static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("application/x-subtitle"));
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static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("text/x-raw, format = { pango-markup, utf8 }"));
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static GstFlowReturn gst_srt_enc_chain (GstPad * pad, GstObject * parent,
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GstBuffer * buf);
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static gboolean gst_srt_enc_event (GstPad * pad, GstObject * parent,
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GstEvent * event);
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static void gst_srt_enc_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static void gst_srt_enc_reset (GstSrtEnc * srtenc);
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static void gst_srt_enc_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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#define parent_class gst_srt_enc_parent_class
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G_DEFINE_TYPE (GstSrtEnc, gst_srt_enc, GST_TYPE_ELEMENT);
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GST_ELEMENT_REGISTER_DEFINE (srtenc, "srtenc", GST_RANK_NONE, GST_TYPE_SRT_ENC);
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static void
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gst_srt_enc_append_timestamp_to_string (GstClockTime timestamp, GString * str)
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{
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guint h, m, s, ms;
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h = timestamp / (3600 * GST_SECOND);
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timestamp -= h * 3600 * GST_SECOND;
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m = timestamp / (60 * GST_SECOND);
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timestamp -= m * 60 * GST_SECOND;
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s = timestamp / GST_SECOND;
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timestamp -= s * GST_SECOND;
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ms = timestamp / GST_MSECOND;
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g_string_append_printf (str, "%.2d:%.2d:%.2d,%.3d", h, m, s, ms);
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}
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static GstFlowReturn
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gst_srt_enc_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
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{
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GstSrtEnc *srtenc = GST_SRT_ENC (parent);
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GstClockTime ts, dur = GST_SECOND;
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GstBuffer *new_buffer;
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GstMapInfo map_info;
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GString *s;
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gsize buf_size;
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gst_object_sync_values (GST_OBJECT (srtenc), GST_BUFFER_PTS (buf));
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ts = GST_BUFFER_PTS (buf) + srtenc->timestamp;
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if (GST_BUFFER_DURATION_IS_VALID (buf))
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dur = GST_BUFFER_DURATION (buf) + srtenc->duration;
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else if (srtenc->duration > 0)
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dur = srtenc->duration;
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else
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dur = GST_SECOND;
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buf_size = gst_buffer_get_size (buf);
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s = g_string_sized_new (10 + 50 + buf_size + 2 + 1);
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/* stanza count */
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g_string_append_printf (s, "%d\n", srtenc->counter++);
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/* start_time --> end_time */
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gst_srt_enc_append_timestamp_to_string (ts, s);
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g_string_append_printf (s, " --> ");
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gst_srt_enc_append_timestamp_to_string (ts + dur, s);
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g_string_append_c (s, '\n');
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/* text */
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if (gst_buffer_map (buf, &map_info, GST_MAP_READ)) {
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g_string_append_len (s, (const gchar *) map_info.data, map_info.size);
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gst_buffer_unmap (buf, &map_info);
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}
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g_string_append (s, "\n\n");
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buf_size = s->len;
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new_buffer = gst_buffer_new_wrapped (g_string_free (s, FALSE), buf_size);
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GST_BUFFER_TIMESTAMP (new_buffer) = GST_BUFFER_TIMESTAMP (buf);
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GST_BUFFER_DURATION (new_buffer) = GST_BUFFER_DURATION (buf);
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gst_buffer_unref (buf);
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return gst_pad_push (srtenc->srcpad, new_buffer);
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}
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static gboolean
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gst_srt_enc_event (GstPad * pad, GstObject * parent, GstEvent * event)
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{
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GstSrtEnc *srtenc = GST_SRT_ENC (parent);
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gboolean ret;
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switch (GST_EVENT_TYPE (event)) {
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case GST_EVENT_CAPS:
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{
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GstCaps *caps;
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caps = gst_static_pad_template_get_caps (&src_template);
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gst_pad_set_caps (srtenc->srcpad, caps);
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gst_caps_unref (caps);
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gst_event_unref (event);
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ret = TRUE;
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break;
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}
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default:
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ret = gst_pad_event_default (pad, parent, event);
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break;
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}
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return ret;
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}
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static void
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gst_srt_enc_reset (GstSrtEnc * srtenc)
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{
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srtenc->counter = 1;
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}
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static GstStateChangeReturn
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gst_srt_enc_change_state (GstElement * element, GstStateChange transition)
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{
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GstStateChangeReturn ret;
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GstSrtEnc *srtenc = GST_SRT_ENC (element);
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ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
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if (ret == GST_STATE_CHANGE_FAILURE)
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return ret;
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switch (transition) {
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case GST_STATE_CHANGE_PAUSED_TO_READY:
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gst_srt_enc_reset (srtenc);
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break;
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default:
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break;
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}
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return ret;
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}
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static void
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gst_srt_enc_get_property (GObject * object,
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guint prop_id, GValue * value, GParamSpec * pspec)
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{
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GstSrtEnc *srtenc;
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srtenc = GST_SRT_ENC (object);
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switch (prop_id) {
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case PROP_TIMESTAMP:
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g_value_set_int64 (value, srtenc->timestamp);
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break;
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case PROP_DURATION:
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g_value_set_int64 (value, srtenc->duration);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_srt_enc_set_property (GObject * object,
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guint prop_id, const GValue * value, GParamSpec * pspec)
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{
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GstSrtEnc *srtenc;
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srtenc = GST_SRT_ENC (object);
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switch (prop_id) {
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case PROP_TIMESTAMP:
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srtenc->timestamp = g_value_get_int64 (value);
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break;
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case PROP_DURATION:
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srtenc->duration = g_value_get_int64 (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_srt_enc_class_init (GstSrtEncClass * klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
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gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_srt_enc_set_property);
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gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_srt_enc_get_property);
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element_class->change_state = GST_DEBUG_FUNCPTR (gst_srt_enc_change_state);
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g_object_class_install_property (gobject_class, PROP_TIMESTAMP,
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g_param_spec_int64 ("timestamp", "Offset for the starttime",
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"Offset for the starttime for the subtitles", G_MININT64, G_MAXINT64,
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0,
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G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_DURATION,
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g_param_spec_int64 ("duration", "Offset for the duration",
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"Offset for the duration of the subtitles", G_MININT64, G_MAXINT64,
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0,
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G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS));
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gst_element_class_add_static_pad_template (element_class, &sink_template);
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gst_element_class_add_static_pad_template (element_class, &src_template);
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gst_element_class_set_static_metadata (element_class,
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"Srt encoder", "Codec/Encoder/Subtitle",
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"Srt subtitle encoder", "Thijs Vermeir <thijsvermeir@gmail.com>");
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GST_DEBUG_CATEGORY_INIT (srtenc_debug, "srtenc", 0,
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"SubRip subtitle encoder");
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}
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static void
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gst_srt_enc_init (GstSrtEnc * srtenc)
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{
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gst_srt_enc_reset (srtenc);
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srtenc->srcpad = gst_pad_new_from_static_template (&src_template, "src");
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gst_element_add_pad (GST_ELEMENT (srtenc), srtenc->srcpad);
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srtenc->sinkpad = gst_pad_new_from_static_template (&sink_template, "sink");
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gst_pad_set_chain_function (srtenc->sinkpad,
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GST_DEBUG_FUNCPTR (gst_srt_enc_chain));
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gst_pad_set_event_function (srtenc->sinkpad,
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GST_DEBUG_FUNCPTR (gst_srt_enc_event));
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gst_element_add_pad (GST_ELEMENT (srtenc), srtenc->sinkpad);
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}
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